Patrick McKenna is a Canadian comedian and actor. He is best known for playing Harold Green on the television series The Red Green Show. Patrick McKenna became interested in Second City when a high-school teacher took him to a show at Second City Toronto. After he graduated from high school, he attended Sheridan College, graduating with a business degree in 1982. To help with tuition, he worked his way to being night manager at Second City, learning how improv worked. In 1983 he auditioned successfully for the main stage. During the 1980s he tried his hand at standup and spent 5 years performing his act in Canada and the USA.